Effect of the use of a thermoelectric generator on the pumping work of a diesel engine

Ezzitouni, Samir; Fernández-Yáñez, Pablo; Rodríguez, Luis Sánchez; Armas, Octavio; Soto, Felipe

doi:10.1177/1468087419868047

Cited by 12 publications

(6 citation statements)

References 33 publications

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“…This model can accurately predict the dynamic performance of automotive thermoelectric power generation system . In addition, TEG changes the flow section of the exhaust pipe to improve power generation efficiency, but it will increase the pump gas loss of the engine …”

Section: Application Of Exhaust Energy Recovery Technology At Variabl...mentioning

confidence: 99%

“…58 In addition, TEG changes the flow section of the exhaust pipe to improve power generation efficiency, but it will increase the pump gas loss of the engine. 59 The main problem of thermoelectric conversion technology in recovering ICE exhaust waste heat is that the conversion efficiency of the thermoelectric conversion module is too low, which is generally below 4%. A review of the research on automobile exhaust thermoelectric generation technology shows that TEG is affected by the optimization of materials, electrical component and overall route, so it cannot be fully applied to commercial automobile filed in the future.…”

Section: Thermoelectric Conversion Technologymentioning

confidence: 99%

“… 58 In addition, TEG changes the flow section of the exhaust pipe to improve power generation efficiency, but it will increase the pump gas loss of the engine. 59 …”

Section: Application Of Exhaust Energy Recovery Technology At Variabl...mentioning

confidence: 99%

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Summary of Turbocharging as a Waste Heat Recovery System for a Variable Altitude Internal Combustion Engine

et al. 2023

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The increase in altitude causes the decrease in internal combustion engine power and the increase in pollutant emission. Converting waste heat into more useful forms of energy through the recovery of waste heat from internal combustion engines is the most promising mechanism for improving both of these goals. This paper comprehensively reviews the development and research of waste heat recovery technology of an internal combustion engine in a variable altitude environment. It is found that exhaust gas turbocharging is the most promising waste heat recovery technology to restore high-altitude internal combustion engine power. Turbochargers are affected by low temperature and low pressure at high altitudes, resulting in poor environmental adaptability, inadequate supercharging ratios, and decreased supercharging efficiency. Therefore, it is very important to select the high pressurization system facing the plateau area and its reasonable matching characteristics. The quality of exhaust energy determines how much waste heat a turbine can recover, and only the exergy part of exhaust energy can realize heat/work conversion. The main disadvantage of turbocharging technology applied in the plateau area is that the speed ratio deviates from the design value, leading to the increase of flow loss inside the supercharger. Therefore, optimizing the internal flow field of a high-altitude supercharger is a key problem to improve the efficiency of energy recovery. The conclusion drawn from this Review is that a two-stage turbocharging system will be a key technology to improve the thermal efficiency and reduce the fuel consumption of high-altitude internal combustion engines in the coming decades. In addition, the efficient utilization of the exhaust energy of the two-stage turbine and the influence of the variable compression process of the two-stage compressor on the working medium in the cylinder will be the focus of future research.

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Section: Application Of Exhaust Energy Recovery Technology At Variabl...mentioning

confidence: 99%

Section: Thermoelectric Conversion Technologymentioning

confidence: 99%

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Summary of Turbocharging as a Waste Heat Recovery System for a Variable Altitude Internal Combustion Engine

et al. 2023

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“…It is necessary to minimize the impact on engine operation, which means that the backpressure produced by the heat exchanger must be reduced as well [12]. In Fernández-Yáñez et al [9], a design of experiments for a flat-shaped TEG heat exchanger was created, and the influence of internal geometry features was analyzed.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer in Thermoelectric Generators for Waste Energy Recovery in Piston Engines

Fernández-Yáñez,

Jarama,

Martos

et al. 2023

Applied Sciences

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This paper investigates the design of a thermoelectric generator for exhaust gases from internal combustion engines. Experimentally validated CFD methodology was employed. Different issues are studied, such as the influence of the replacement of the exhaust pipe for the TEG, the recirculation produced, and the influence of fins. The results show that an enlarged inlet cone reduces the recirculation and the pressure drop of the TEG, but more heat is lost across the cone walls, reducing the heat available for the thermoelectric modules. Internal straight fins aligned with the flow achieved a 3% increase in heat transfer, did not significantly increase the pressure drop in this type of device, and reduced the effects on pressure of the recirculation, lowering the overall pressure drop by 10%. An energy production of 175.9 W with 16.2 W of pressure drop power losses resulted in a net energy production of 160.7 W. A comparison with a flat-type thermoelectric generator under the same hot source conditions is also provided.

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“…23,24 Multi-cylinder engines can benefit from waste heat recovery (WHR) as roughly one-third of energy is wasted in the exhaust. 25 WHR methods such as thermoelectric generators, 26,27 organic Rankine cycle 28 and inverted Brayton cycle 29 have been used for improving engine efficiency. Turbocharging is one of the critical technologies for WHR.…”

Section: Introductionmentioning

confidence: 99%

A novel method to overcome the shortcomings of turbocharging a single cylinder diesel engine

Ramkumar

Krishnasamy

Ramesh

2021

International Journal of Engine Research

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Single-cylinder diesel engines are generally not turbocharged because of highly pulsating exhaust gas flow, resulting in increased speed fluctuations and reduced turbine performance. In the present work, a novel and simple method is proposed wherein an exhaust plenum is placed before the turbine to reduce the flow fluctuations. A production light-duty naturally aspirated (NA) diesel engine modified into the turbocharged version was incorporated with an exhaust plenum. Steady-state experiments were performed with the base naturally aspirated engine, the turbocharged version without an exhaust plenum (conventional pulse turbocharging), and the turbocharged version with the exhaust plenum. The present work attempts to establish the limitations of conventional pulse turbocharging in a single-cylinder diesel engine unavailable in the existing literature. Though the conventional pulse turbocharged version could deliver a boost pressure of about 2 bar (absolute), a brake power reduction of 40% and the associated drop in brake mean effective pressure was observed compared to the base NA engine due to high exhaust back pressures. The pumping work was four times higher in conventional pulse turbocharging than the NA engine, thus reducing the performance. After validating the simulation models, a one-dimensional simulation tool was used to evaluate the effect of incorporating exhaust plenum before the turbine. Simulated results predicted the brake power output within a 3% error for the NA and plenum turbocharging configurations. An optimal plenum volume was arrived at using the validated simulation model. Subsequent experiments on the turbocharged engine with the plenum in place showed a significant improvement in the engine performance and reduced exhaust emissions compared to the NA version. Brake power output was enhanced by 25%, which indicated improved thermal efficiency of 2%. Compared to the NA version, the soot, carbon monoxide (CO) and unburned hydrocarbon HC emissions were reduced by 93%, 88%, and 53%, respectively. However, an increase in oxides of nitrogen (NOx) emissions was seen, which can be controlled with suitable mitigation methods taking advantage of the significantly lower soot levels. Thus, the proposed method of placing an exhaust plenum before the turbine makes turbocharging viable on single-cylinder diesel engines with performance improvement and emission reduction when suitable NOx mitigation measures are adopted.

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Effect of the use of a thermoelectric generator on the pumping work of a diesel engine

Cited by 12 publications

References 33 publications

Summary of Turbocharging as a Waste Heat Recovery System for a Variable Altitude Internal Combustion Engine

Summary of Turbocharging as a Waste Heat Recovery System for a Variable Altitude Internal Combustion Engine

Heat Transfer in Thermoelectric Generators for Waste Energy Recovery in Piston Engines

A novel method to overcome the shortcomings of turbocharging a single cylinder diesel engine

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